CN107002615B - Diaphragm and pulsation damper using the same - Google Patents
Diaphragm and pulsation damper using the same Download PDFInfo
- Publication number
- CN107002615B CN107002615B CN201580066432.5A CN201580066432A CN107002615B CN 107002615 B CN107002615 B CN 107002615B CN 201580066432 A CN201580066432 A CN 201580066432A CN 107002615 B CN107002615 B CN 107002615B
- Authority
- CN
- China
- Prior art keywords
- diaphragm
- protruding
- annular
- pulsation damper
- curvature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M37/00—Apparatus or systems for feeding liquid fuel from storage containers to carburettors or fuel-injection apparatus; Arrangements for purifying liquid fuel specially adapted for, or arranged on, internal-combustion engines
- F02M37/0011—Constructional details; Manufacturing or assembly of elements of fuel systems; Materials therefor
- F02M37/0041—Means for damping pressure pulsations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/20—Varying fuel delivery in quantity or timing
- F02M59/36—Varying fuel delivery in quantity or timing by variably-timed valves controlling fuel passages to pumping elements or overflow passages
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Diaphragms And Bellows (AREA)
Abstract
The present invention provides a diaphragm formed of a thin metal plate, the diaphragm including a flange portion and a protruding portion protruding toward one side of the flange portion, the protruding portion having a flat top portion and at least two annular curved portions annularly provided radially outside the top portion in a state where a pressure on an outer wall side and a pressure on an inner wall side of the protruding portion are the same, at least two of the annular curved portions being formed to be curved in a cross section taken along an imaginary plane including a center line of the diaphragm, centers of curvature of the at least two annular curved portions being disposed at different positions on opposite sides in a protruding direction of the protruding portion.
Description
Technical Field
The present invention relates to a diaphragm and a pulsation damper using the same, and more particularly, to a diaphragm capable of effectively reducing pulsation generated in a fuel pump and a pulsation damper using the same.
Background
A pulsation damper is known as follows: in a conventional high-pressure fuel pump or the like, pulsation of a fluid sucked into a pressurizing chamber of a housing main body from an intake passage is absorbed by a diaphragm provided in a low-pressure fuel passage for supplying fuel to the pressurizing chamber, and the pulsation of the fluid is reduced (for example, see patent document 1).
In such a conventional pulsation damper, the diaphragm is formed by press working using a metal plate such as stainless steel, for example, and has a protrusion in one direction, and the top portion (central portion) of the protrusion is a flat surface parallel to the flange on the outer periphery thereof.
The pulsation damper is configured by welding the diaphragm all around a predetermined flat plate (metal plate), or by welding the metal plate and the diaphragm all around with the flat plate sandwiched between two diaphragms, or by arranging two diaphragms directly facing each other without using a metal plate and welding the two diaphragms all around.
In this case, an inert gas such as helium or nitrogen is sealed at a predetermined pressure in a space defined by the membrane and the metal plate or a space defined between the two membranes.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication No. 2007-309118
Problems to be solved by the invention
However, in the pulsation damper described in patent document 1, since the volume change amount is not sufficiently large with respect to the pressure load from the outside of the pulsation damper, there is a possibility that the pulsation (large pressure variation due to high pressure) cannot be completely absorbed by the applied high-pressure pump.
Disclosure of Invention
Accordingly, an object of the present invention is to provide a diaphragm capable of obtaining a large pulsation reduction effect in the case of being applied to a fuel pump, and a pulsation damper employing the diaphragm.
Means for solving the problems
In order to achieve the above object, a diaphragm according to the present invention is a diaphragm formed of a thin metal plate, the diaphragm including a flange portion and a protruding portion protruding toward one side of the flange portion, the protruding portion including a flat top portion and at least two annular curved portions annularly provided on a radially outer side of the top portion in a state where a pressure on an outer wall side of the protruding portion and a pressure on an inner wall side of the protruding portion are the same, the at least two annular curved portions being formed to be curved in a cross section taken along an imaginary plane including a center line of the diaphragm, centers of curvature of the at least two annular curved portions being disposed at different positions on opposite sides of a protruding direction of the protruding portion, the center of curvature of the at least two annular curved portions being located on a radially outermost side of the annular curved portions over an entire region from the annular curved portion formed on the radially outermost side of the at least two annular curved portions to, the protruding portion does not have a curved portion whose center of curvature is arranged on the same side as the protruding direction of the protruding portion.
That is, in the diaphragm described in patent document 1, the top surface of the protrusion is a plane parallel to the outer peripheral surface of the diaphragm, and the outer peripheral portion of the bottom portion (bottom contour portion) is formed as only one annular curved portion.
In the diaphragm, the protruding portion may have a connecting portion that connects at least two of the annular curved portions to each other, and the connecting portion may be formed in a straight line shape that is inclined with respect to the apex portion in a cross section taken along an imaginary plane including a center line of the diaphragm in a state where a pressure on an outer wall side and a pressure on an inner wall side of the protruding portion are the same.
In the diaphragm, at least two of the annular curved portions may have different radii of curvature in a cross section taken along an imaginary plane including a center line of the diaphragm.
In another diaphragm according to the present invention, the other diaphragm is formed of a thin metal plate, the other diaphragm has a flange portion and a protruding portion protruding to one side of the flange portion, the protruding portion has a central curved portion and at least one annular curved portion provided annularly on an outer side in a radial direction of the central curved portion, the central curved portion and the at least one annular curved portion are both formed so as to be curved in a cross section taken along an imaginary plane including a center line of the diaphragm in a state where a pressure on an outer wall side of the protruding portion and a pressure on an inner wall side are the same, centers of curvature of the central curved portion and the at least one annular curved portion are both located on an opposite side to a protruding direction of the protruding portion, and a center of curvature of the central curved portion is located on a center line of the diaphragm, the protruding portion does not have a curved portion whose center of curvature is arranged on the same side as the protruding direction of the protruding portion over the entire region from the annular curved portion formed on the outermost side in the radial direction among the at least one annular curved portion to the center line of the diaphragm.
The diaphragm of the present invention is joined to other members to form a closed space, and thus can be applied as a pulsation damper. The closed space is filled with an inert gas.
In this case, the other member may be a diaphragm having the same shape, a diaphragm having a different shape, a flat plate, or the like.
Effects of the invention
According to the pulsation damper using the diaphragm of the present invention, when applied to a fuel pump, the volume change amount with respect to pressure fluctuation can be increased, and therefore a large pulsation reduction effect can be obtained.
Drawings
Fig. 1 is a cross-sectional view of a diaphragm of the first embodiment of the present invention, taken along an imaginary plane that includes the centerline of the diaphragm.
Fig. 2 is a top view of the diaphragm shown in fig. 1.
Fig. 3 is a cross-sectional view of a diaphragm of the second embodiment of the present invention taken along an imaginary plane that includes the centerline of the diaphragm.
Fig. 4 is a top view of the diaphragm shown in fig. 3.
Fig. 5 is a cross-sectional view showing an example of a case where the diaphragm according to the first embodiment of the present invention is applied to a pulsation damper.
Fig. 6 is a cross-sectional view showing an example of a case where a diaphragm according to a second embodiment of the present invention is applied to a pulsation damper.
Fig. 7 is a cross-sectional view showing a modification of the diaphragm according to the first embodiment of the present invention applied to a pulsation damper.
Fig. 8 is a cross-sectional view showing another modification example of the case where the diaphragm according to the first embodiment of the present invention is applied to a pulsation damper.
Fig. 9 is a cross-sectional view showing still another modification of the case where the diaphragm according to the first embodiment of the present invention is applied to a pulsation damper.
Fig. 10 is a cross-sectional view showing still another modification of the case where the diaphragm according to the first embodiment of the present invention is applied to a pulsation damper.
Fig. 11 is a cross-sectional view showing still another modification of the case where the diaphragm according to the first embodiment of the present invention is applied to a pulsation damper.
Fig. 12 is a graph showing characteristics of a pulsation damper using the diaphragms according to the first and second embodiments of the present invention shown in fig. 1 and 3.
Detailed Description
Fig. 1 is a cross-sectional view of the diaphragm 10 according to the first embodiment of the present invention taken along an imaginary plane including a center line (vertical line) O1 of the diaphragm 10, and fig. 2 is a plan view of the diaphragm 10 shown in fig. 1. In the following description, a cross section taken along an imaginary plane as shown in fig. 1 will be referred to as a "central cross section".
In general, the pulsation damper is used in a state in which an inert gas is sealed inside the protruding portion of the diaphragm at a pressure higher than atmospheric pressure, but fig. 1 and 2 show a state in which no gas is sealed inside the protruding portion 10A, and the pressure on the outer wall side (protruding side) of the protruding portion 10A and the pressure on the inner wall side are the same.
As shown in fig. 1 and 2, the diaphragm 10 of the first embodiment is formed by performing plastic working such as pressing on a thin metal plate such as a stainless steel plate to be formed into an outer circular shape (each portion has a circular horizontal cross section).
The diaphragm 10 is provided with a first annular curved portion 11 and a second annular curved portion 12, the first annular curved portion 11 having a curvature center denoted by symbol R11C and a curvature radius denoted by R11 in a central cross section, the second annular curved portion 12 having a curvature radius denoted by symbol R12C and a curvature center denoted by R12 in the same central cross section, and a central portion (top portion 10S) surrounded by the first annular curved portion 11 is formed in a flat shape, whereby the diaphragm 10 is provided with a protruding portion 10A protruding in one direction, and a recessed portion 10B is formed on the opposite side of the protruding portion 10A (inner wall side of the protruding portion 10A).
In the appearance of the diaphragm 10, the first annular curved portion 11 and the second annular curved portion 12 are formed as two annular curved portions annularly provided on the radially outer side of the top portion 10S formed in a planar shape.
An annular flange 10C is formed on the outer periphery of the protruding portion 10A, and the protruding portion 10A is configured to protrude toward one side of the annular flange 10C.
Both the center of curvature R11C of the first annular curved portion 11 and the center of curvature R12C of the second annular curved portion 12 are provided at different positions on the opposite side to the projecting direction of the projecting portion 10A (the inner wall side of the projecting portion 10A).
In the first embodiment, the connecting portion 10R connecting the first annular curved portion 11 and the second annular curved portion 12 is formed to be substantially linear in the central cross section and inclined with respect to the apex portion.
The first embodiment is configured such that two kinds of annular curved portions (a first annular curved portion 11 and a second annular curved portion 12) are formed in a central cross section. Therefore, as shown in fig. 1, when the radius of curvature R11 of the first annular curved portion 11 and the radius of curvature R12 of the second annular curved portion 12 are set to have different sizes, the connecting portion 10R may not be particularly provided. In this case, the curvature centers R11C and R12C are at different positions.
When the radius of curvature R11 of the first annular curved portion 11 and the radius of curvature R12 of the second annular curved portion 12 are the same size, a straight inclined surface (connecting portion 10R) is provided, and the centers of curvature R11C and R12C are located at different positions.
In the first embodiment, two annular bent portions are formed, but three or more annular bent portions may be formed.
Fig. 3 is a sectional view of the diaphragm 20 of the second embodiment of the present invention, taken along an imaginary plane including a center line O2 of the diaphragm 20, and fig. 4 is a plan view of the diaphragm 20 shown in fig. 3. In fig. 3 and 4, as in fig. 1 and 2, the inside of the protruding portion 20A is not filled with gas, and the pressure on the outer wall side and the pressure on the inner wall side of the protruding portion 20A are the same.
The diaphragm 20 is formed by plastic working such as pressing a thin metal plate such as a stainless steel plate in the same manner as the diaphragm 10 of the first embodiment so that the horizontal cross section of each portion becomes circular.
The diaphragm 20 is formed with a central curved portion 25 having a large radius of curvature R25 with the symbol R25C as the center of curvature in the central portion of the central cross section, and an annular curved portion 22 provided around the central curved portion 25 and having a radius of curvature R22 (but smaller than R25) with the symbol R22C as the center of curvature in the central cross section.
Here, the annular bent portion 22 is provided in an annular shape on the outer side in the radial direction of the central bent portion 25 in the appearance of the diaphragm 20. That is, the diaphragm 20 includes one-stage (one) annular bent portion (annular curved portion 22) and a protruding portion 20A having a dome-shaped top portion.
An annular flange 20C is formed on the outer periphery of the protruding portion 20A, and the protruding portion 20A is configured to protrude toward one side of the annular flange 20C.
As shown in fig. 3 and 4, the center of curvature R25C of the central curved portion 25 and the center of curvature R22C of the annular curved portion 22 are both provided at different positions on the opposite side to the projecting direction of the projecting portion 20A (the inner wall side of the projecting portion 20A), and the center of curvature R25C of the central curved portion 25 is located on the center line O2 of the diaphragm 20.
In the second embodiment, one central bending portion and one annular bending portion are formed, but one central bending portion and two or more annular bending portions may be formed (that is, for example, the central bending portion may be added to the structure of the diaphragm 10 in fig. 1 and 2).
Fig. 5 is a view showing an example of the case where the diaphragm according to the first embodiment of the present invention shown in fig. 1 and 2 is applied to a pulsation damper, and is a cross-sectional view taken along an imaginary plane including a center line O3 of the pulsation damper.
As shown in fig. 5, the pulsation damper 100 uses two diaphragms 10 shown in fig. 1 and 2, and the respective flange portions 10C are overlapped so that the concave portions 10B face each other, and after an inert gas such as helium gas or nitrogen gas is sealed into the pulsation damper 100 at a predetermined pressure, the flange portions 10C are welded all around by laser welding or the like to be integrated.
Fig. 5 shows a state where the internal pressure (inert gas filling pressure) and the external pressure of the pulsation damper 100 are equal to each other, and when the pulsation damper 100 is left in the atmosphere (that is, when the internal pressure of the pulsation damper 100 is lower than the external pressure), the center indicated by the broken line of the reference numeral 10P has an expanded shape.
For example, as shown in patent document 1, the pulsation damper 100 illustrated in fig. 5 can be attached to a fuel passage of a fuel pump or the like and used for reducing pressure pulsation in the pump.
In this case, since a plurality of annular curved portions are formed in the embodiment of fig. 5, the amount of deformation during operation of the pulsation damper (during deformation due to pulsation) is increased as compared with the case where one annular curved portion is provided as shown in patent document 1, and the pulsation preventing effect of the pulsation damper is improved.
Here, in the case where a plurality of annular curved portions are formed, and the centers of curvature of the plurality of annular curved portions are alternately located in both the projecting direction (outer wall direction) and the opposite direction (inner wall direction) to the projecting direction of the diaphragm projecting portion (that is, the diaphragm is curved with irregularities), during operation of the pulsation damper, particularly when the external pressure is higher than the enclosed pressure of the inert gas, there is a concern that: at the curved portions whose curvature centers are in the protruding direction of the diaphragm, the curvature increases (i.e., the radius of curvature decreases), stress concentrates on these annular curved portions, and the durability of the pulsation damper decreases.
However, in the embodiment shown in fig. 5, the centers of curvature of the plurality of annular curved portions 11 and 12 are all in the opposite direction to the projecting direction of the diaphragm projecting portion, and even in a state where the external pressure is higher than the enclosing pressure of the inert gas, the radii of curvature of the annular curved portions 11 and 12 are not reduced, and the pulsation preventing effect of the pulsation damper is improved and the durability of the pulsation damper is also improved.
Fig. 6 is a view showing an example of a case where the diaphragm according to the second embodiment of the present invention shown in fig. 3 and 4 is applied to a pulsation damper, and is a cross-sectional view taken along an imaginary plane including a center line O4 of the pulsation damper.
The pulsation damper 200 employs two diaphragms 20 shown in fig. 3 and 4, and the respective flange portions 20C are overlapped so that the concave portions 20B face each other, and after an inert gas such as helium gas or nitrogen gas is sealed into the pulsation damper 200 at a predetermined pressure, the flange portions 20C are welded all around by laser welding or the like to be integrated.
Fig. 6 also shows a state where the internal pressure and the external pressure of the pulsation damper 200 are equal to each other, and when the pulsation damper 200 is placed in the atmosphere, the center indicated by the broken line of the reference numeral 20P has an expanded shape.
The pulsation damper 200 having such a configuration can be used for applications in which the pulsation damper is attached to a fuel passage of a fuel pump or the like to reduce pressure pulsation in the pump. In this case, since the embodiment of fig. 6 has one annular bent portion 22 and one central bent portion 25 formed at the center of the annular bent portion 22, the amount of deformation during operation of the pulsation damper is increased as compared with the case of patent document 1, as in the embodiment of fig. 5, and the pulsation preventing effect of the pulsation damper is improved.
In the pulsation damper 200, since the protruding portion 20A of the diaphragm 20 is provided with the central curved portion 25 and is curved outward in advance, the amount of deformation (the amount of change in the volume inside the pulsation damper) of the pulsation damper 200 is smaller in a state where the external pressure is smaller than the sealing pressure, and the diaphragm is curved in the direction opposite to the direction of the outward curve in advance in a state where the external pressure is larger than the sealing pressure, as compared with the case of patent document 1 where the diaphragm central portion is flat, the amount of change in the volume is at least increased by the amount of volume obtained by the outward curve in advance.
When the amount of change of the pulsation damper is increased when pulsation of a predetermined pressure or more is generated, the pulsation preventing effect is high, and therefore, the pulsation preventing effect corresponding to the predetermined pulsation pressure can be further improved by adjusting the sealing pressure of the inert gas sealed in the pulsation damper 200.
Fig. 7 to 11 are views showing modifications of the diaphragm according to the first embodiment of the present invention applied to the pulsation damper, and are cross-sectional views of the pulsation damper taken along an imaginary plane including center lines O5 to O9 of the pulsation damper. In fig. 7 to 11, the same reference numerals as those in fig. 1 and 2 denote the same or equivalent portions. Fig. 7 to 11 also show a state where the internal pressure and the external pressure of the pulsation damper are equal to each other, as in fig. 5 and 6, and when the pulsation damper is placed in the atmosphere, the center indicated by the broken lines of the reference numerals 10P and 90P has an expanded shape.
The pulsation damper 300 shown in fig. 7 is formed by overlapping the diaphragm 10 shown in fig. 1 and 2 with the support plate 50 formed of a circular plate-shaped flat plate made of a stainless steel plate or the like, enclosing an inert gas such as helium gas or nitrogen gas at a predetermined pressure inside the pulsation damper 300, and then welding and integrating the flange portion 10C and the outer peripheral portion 50C of the support plate 50 all around by laser welding or the like.
In the pulsation damper 400 shown in fig. 8, a recess 60A is formed in the center of the support plate 60 of a disc-shaped flat plate, the support plate 60 and the diaphragm 10 are overlapped with each other in a state where the recess 60A is inserted into the recess 10B of the diaphragm 10, an inert gas such as helium gas or nitrogen gas is sealed into the pulsation damper 400 at a predetermined pressure, and then the flange portion 10C and the outer peripheral portion 60C of the support plate 60 are welded and integrated all around by laser welding or the like.
This modification reduces the internal volume of the pulsation damper 300 shown in fig. 7, and by merely adjusting the shape, i.e., the volume, of the recess 60A, it is possible to obtain the characteristics (pulsation absorption characteristics) required for the pulsation damper 400 while using the common diaphragm 10.
The pulsation damper 500 shown in fig. 9 is formed such that a convex portion 70A is formed in the center of the support plate 70 of a disc-shaped flat plate, the support plate 70 and the diaphragm 10 are overlapped with each other in a state where the convex portion 70A is located on the opposite side of the concave portion 10B of the diaphragm 10, an inert gas such as helium gas or nitrogen gas is sealed into the pulsation damper 500 at a predetermined pressure, and then the flange portion 10C and the outer peripheral portion 70C of the support plate 70 are welded and integrated all around by laser welding or the like.
This modification increases the internal volume of the pulsation damper 300 shown in fig. 7, contrary to the case of fig. 8. In this modification, the required characteristics of the pulsation damper 500 can be obtained by using the common diaphragm 10 only by changing the volume of the convex portion 70A.
The pulsation damper 600 shown in fig. 10 is formed by arranging one diaphragm 10 shown in fig. 1 and 2 on each side of the support plate 50 shown in fig. 7, overlapping them, sealing inert gas such as helium gas or nitrogen gas into the pulsation damper 600 at a predetermined pressure, and then welding the flange portion 10C of each diaphragm 10 and the outer peripheral portion 50C of the support plate 50 all around by laser welding or the like to be integrated.
This modification is equivalent to a structure in which two sets of pulsation dampers 300 of fig. 7 are stacked. This modification can be adopted according to the characteristics required for the pulsation damper.
In this way, the pulsation damper can be configured by using the diaphragm 10 and the flat plate.
The pulsation damper 700 shown in fig. 11 is configured by using the diaphragm 10 shown in fig. 1 and 2 and the diaphragm 90 having a shape different from that of the diaphragm 10. That is, only one annular bent portion 91 is provided in the diaphragm 90, and the center portion (the region surrounded by the annular bent portion 91) of the protruding portion 90A of the diaphragm 90 is a flat surface when the internal pressure and the external pressure of the pulsation damper are equal.
The flange portion 10C of the diaphragm 10 and the flange portion 90C of the diaphragm 90 are overlapped with each other so that the concave portions 10B and 90B face each other, an inert gas such as helium or nitrogen is sealed into the pulsation damper 700 at a predetermined pressure, and then the flange portions 10C and 90C are welded all around by laser welding or the like to integrate the diaphragms 10 and 90.
This modification can also be adopted according to the characteristics required for the pulsation damper.
In the cases of fig. 7 to 11, the diaphragm 10 shown in fig. 1 and 2 is used, but it is needless to say that the diaphragm 10 may be replaced with the diaphragm 20 shown in fig. 3 and 4.
It is to be noted that the pulsation damper may be constructed by welding the diaphragm 10 shown in fig. 1 and 2 and the diaphragm 20 shown in fig. 3 and 4.
Fig. 12 is a graph showing characteristics of the pulsation damper shown in fig. 5 and 6 and characteristics of the conventional pulsation damper, which are configured by using the diaphragm (shown in fig. 1 and 3) according to the first and second embodiments of the present invention, a solid line shows the characteristics of the pulsation damper shown in fig. 5, a one-dot chain line shows the characteristics of the pulsation damper shown in fig. 6, and a broken line shows the characteristics of the conventional pulsation damper.
The conventional product has a characteristic that a region (top portion) surrounded by one annular bent portion is formed in a planar shape. In addition, the measurement was carried out in the following manner: a predetermined alternating pressure (pulsating pressure) is applied to the pulsation damper, and the amount of change in the volume of the pulsation damper that occurs when the alternating pressure is applied is measured.
The characteristics of the pulsation damper obtained by such a measurement method are evaluated to be high when the volume change amount is large for the same external pressure value, for example.
As shown in fig. 12, when the horizontal axis represents the external pressure around the pulsation damper and the vertical axis represents the volume change amount of the pulsation damper, the external pressure is in the range of about 0.4 to 1.0MPA, and the pulsation dampers shown in fig. 5 and 6 have a larger volume change amount than the conventional products, and therefore the performance evaluation as a damper is high.
In particular, when the external pressure is in the range of 0.8MPA or more, the pulsation damper of fig. 5 having two annular curved portions can obtain a volume change amount of about 1.8 times as large as that of the conventional pulsation damper having only one annular curved portion, and it is understood that the pulsation damper of fig. 6 having one central curved portion and one annular curved portion formed around the central curved portion can obtain a volume change amount of about 1.5 times as large.
Further, it is found by additional experiments that even if the number of the annular curved portions is the same, the volume change amount and the change characteristics of the pulsation damper can be appropriately adjusted by changing the position of the center of curvature, the radius of curvature, and the like of the annular curved portions (results are not shown).
As is apparent from the above description, when the diaphragm of the present invention is applied to a pulsation damper, the required amount of volume change and durability can be obtained by appropriately selecting the number of annular curved portions, the position of the center of curvature, the radius of curvature, and the like.
Description of the symbols
10. 20, 90 diaphragm
10A, 20A, 90A protrusions
10B, 20B, 90B recess
10C, 20C, 90C flange
11. 12 first and second annular curved portions
22 ring-shaped bent part
25 central bending part
100. 200, 300, 400, 500, 600, 700 pulsation damper
Radius of curvature of R11, R12 first and second annular curved portions
Center of curvature of the first and second annular curved portions R11C and R12C
Radius of curvature of R22 circular curved part
Center of curvature of R22C circular bend
Radius of curvature of R25 center bend
Center of curvature of R25C center bend
Claims (16)
1. A membrane, characterized in that the membrane is formed by a metal sheet,
the diaphragm has a flange portion and a protruding portion protruding toward one side of the flange portion,
the protrusion has a flat top portion and at least two annular bent portions annularly provided on a radially outer side of the top portion in a state where a pressure on an outer wall side of the protrusion is equal to a pressure on an inner wall side thereof,
at least two of the annular curved portions are formed so as to be curved in a cross section taken along an imaginary plane including a center line of the diaphragm, and centers of curvature of at least two of the annular curved portions are disposed at different positions on opposite sides of a projecting direction of the projecting portion,
the protruding portion does not have a curved portion whose center of curvature is arranged on the same side as the protruding direction of the protruding portion over the entire region from the annular curved portion formed on the outermost side in the radial direction among the at least two annular curved portions to the center line of the diaphragm.
2. The membrane of claim 1,
the protruding part has a connecting part connecting at least two of the annular bent parts to each other,
when the pressure on the outer wall side and the pressure on the inner wall side of the protrusion are the same, the connection portion is formed in a straight line shape inclined with respect to the apex portion in a cross section taken on an imaginary plane including a center line of the diaphragm.
3. The membrane of claim 2,
in a cross section taken on an imaginary plane including a center line of the diaphragm, at least two of the annular curved portions have different respective radii of curvature.
4. A membrane, characterized in that the membrane is formed by a metal sheet,
the diaphragm has a flange portion and a protruding portion protruding toward one side of the flange portion,
the protruding portion has a central bent portion and at least one annular bent portion annularly provided radially outside the central bent portion,
in a state where the pressure on the outer wall side and the pressure on the inner wall side of the protrusion are the same, in a cross section taken on an imaginary plane including a center line of the diaphragm, the central curved portion and the at least one annular curved portion are both formed so as to be curved, and centers of curvature of the central curved portion and the at least one annular curved portion are both located on opposite sides of a protruding direction of the protrusion and on a center line of the diaphragm,
the protruding portion does not have a curved portion whose center of curvature is arranged on the same side as the protruding direction of the protruding portion over the entire region from the annular curved portion formed on the outermost side in the radial direction among at least one of the annular curved portions to the center line of the diaphragm.
5. A pulsation damper having a flange portion and a protruding portion protruding to one side of the flange portion, wherein two diaphragms formed of a thin metal plate are joined to the flange portion to form a closed space,
the protrusion has a flat top portion and at least two annular bent portions annularly provided on a radially outer side of the top portion in a state where a pressure on an outer wall side of the protrusion is equal to a pressure on an inner wall side thereof,
at least two of the annular curved portions are formed so as to be curved in a cross section taken along an imaginary plane including a center line of the diaphragm, and centers of curvature of at least two of the annular curved portions are disposed at different positions on opposite sides of a projecting direction of the projecting portion,
the protruding portion does not have a curved portion whose center of curvature is arranged on the same side as the protruding direction of the protruding portion over the entire region from the annular curved portion formed on the outermost side in the radial direction among the at least two annular curved portions to the center line of the diaphragm.
6. The pulsation damper according to claim 5,
the two diaphragms are diaphragms having different shapes from each other.
7. The pulsation damper according to claim 6,
and filling the closed space with inert gas.
8. A pulsation damper having a flange portion and a protruding portion protruding to one side of the flange portion, wherein two diaphragms formed of a thin metal plate are joined to the flange portion to form a closed space,
the protruding portion has a central bent portion and at least one annular bent portion annularly provided radially outside the central bent portion,
in a state where the pressure on the outer wall side and the pressure on the inner wall side of the protrusion are the same, in a cross section taken on an imaginary plane including a center line of the diaphragm, the central curved portion and the at least one annular curved portion are both formed so as to be curved, and centers of curvature of the central curved portion and the at least one annular curved portion are both located on opposite sides of a protruding direction of the protrusion and on a center line of the diaphragm,
the protruding portion does not have a curved portion whose center of curvature is arranged on the same side as the protruding direction of the protruding portion over the entire region from the annular curved portion formed on the outermost side in the radial direction among at least one of the annular curved portions to the center line of the diaphragm.
9. The pulsation damper according to claim 8,
the two diaphragms are diaphragms having different shapes from each other.
10. The pulsation damper according to claim 9,
and filling the closed space with inert gas.
11. A pulsation damper having a flange portion and a protruding portion protruding toward one side of the flange portion, wherein a diaphragm formed of a metal thin plate and another member different from the diaphragm are joined to overlap with the flange portion to form a closed space,
the protrusion has a flat top portion and at least two annular bent portions annularly provided on a radially outer side of the top portion in a state where a pressure on an outer wall side of the protrusion is equal to a pressure on an inner wall side thereof,
at least two of the annular curved portions are formed so as to be curved in a cross section taken along an imaginary plane including a center line of the diaphragm, and centers of curvature of at least two of the annular curved portions are disposed at different positions on opposite sides of a projecting direction of the projecting portion,
the protruding portion does not have a curved portion whose center of curvature is arranged on the same side as the protruding direction of the protruding portion over the entire region from the annular curved portion formed on the outermost side in the radial direction among the at least two annular curved portions to the center line of the diaphragm.
12. The pulsation damper according to claim 11,
the other part is a flat plate.
13. The pulsation damper according to claim 12,
and filling the closed space with inert gas.
14. A pulsation damper having a flange portion and a protruding portion protruding toward one side of the flange portion, wherein a diaphragm formed of a metal thin plate and another member different from the diaphragm are joined to overlap with the flange portion to form a closed space,
the protruding portion has a central bent portion and at least one annular bent portion annularly provided radially outside the central bent portion,
in a state where the pressure on the outer wall side and the pressure on the inner wall side of the protrusion are the same, in a cross section taken on an imaginary plane including a center line of the diaphragm, the central curved portion and the at least one annular curved portion are both formed so as to be curved, and centers of curvature of the central curved portion and the at least one annular curved portion are both located on opposite sides of a protruding direction of the protrusion and on a center line of the diaphragm,
the protruding portion does not have a curved portion whose center of curvature is arranged on the same side as the protruding direction of the protruding portion over the entire region from the annular curved portion formed on the outermost side in the radial direction among at least one of the annular curved portions to the center line of the diaphragm.
15. The pulsation damper according to claim 14,
the other part is a flat plate.
16. The pulsation damper according to claim 15,
and filling the closed space with inert gas.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-251675 | 2014-12-12 | ||
| JP2014251675A JP6527689B2 (en) | 2014-12-12 | 2014-12-12 | Diaphragm and pulsation damper using the same |
| PCT/JP2015/082936 WO2016093054A1 (en) | 2014-12-12 | 2015-11-24 | Diaphragm and pulsation damper using same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107002615A CN107002615A (en) | 2017-08-01 |
| CN107002615B true CN107002615B (en) | 2019-12-20 |
Family
ID=56107244
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580066432.5A Active CN107002615B (en) | 2014-12-12 | 2015-11-24 | Diaphragm and pulsation damper using the same |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US10480466B2 (en) |
| JP (1) | JP6527689B2 (en) |
| CN (1) | CN107002615B (en) |
| WO (1) | WO2016093054A1 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6810153B2 (en) * | 2016-09-26 | 2021-01-06 | イーグル工業株式会社 | Metal diaphragm damper |
| JP6919314B2 (en) * | 2017-05-11 | 2021-08-18 | 株式会社デンソー | Pulsation damper and fuel pump device |
| EP3715618B1 (en) * | 2017-11-24 | 2022-10-19 | Eagle Industry Co., Ltd. | Metal diaphragm damper |
| EP3715617A4 (en) * | 2017-11-24 | 2021-07-14 | Eagle Industry Co., Ltd. | Metal diaphragm damper and manufacturing method for same |
| JP7074563B2 (en) | 2018-05-18 | 2022-05-24 | イーグル工業株式会社 | Damper device |
| KR20200130452A (en) | 2018-05-18 | 2020-11-18 | 이구루코교 가부시기가이샤 | Damper unit |
| US11293391B2 (en) | 2018-05-18 | 2022-04-05 | Eagle Industry Co., Ltd. | Damper device |
| KR20200140902A (en) | 2018-05-25 | 2020-12-16 | 이구루코교 가부시기가이샤 | Damper device |
| JP7041956B2 (en) * | 2018-09-20 | 2022-03-25 | 株式会社不二工機 | Pulsation damper |
| CN109763951B (en) * | 2019-01-29 | 2024-05-10 | 中国寰球工程有限公司 | Double-diaphragm pulsation damper |
| JP7373453B2 (en) * | 2020-04-10 | 2023-11-02 | 株式会社Ｉｈｉエアロスペース | Liquid propellant supply system and satellite propulsion system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1135250A (en) * | 1994-09-14 | 1996-11-06 | 罗伯特·博施有限公司 | Fuel-injection system for two-stroke internal-combustion engine |
Family Cites Families (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3628573A (en) * | 1970-07-21 | 1971-12-21 | Alpura Ag | Diaphragm chamber-damping device for damping fluid shocks in pipe systems |
| US3862708A (en) * | 1973-10-11 | 1975-01-28 | Horix Mfg Co | Container filling device with flow control |
| US4077882A (en) * | 1976-09-27 | 1978-03-07 | Ronald Gangemi | Isolating and blood pressure transmitting apparatus for extracorporeal blood treatment system |
| US4315527A (en) * | 1980-01-14 | 1982-02-16 | Tmi Sales Corporation | Expansion tanks for pressurized fluids and diaphragms therefor |
| US5505181A (en) | 1995-02-13 | 1996-04-09 | Siemens Automotive Corporation | Integral pressure damper |
| US6901964B2 (en) * | 2001-03-30 | 2005-06-07 | Saturn Electronics & Engineering, Inc. | Vehicle fuel pulse damper |
| JP2003083199A (en) * | 2001-09-05 | 2003-03-19 | Piolax Inc | Pulsation damper for fuel delivery pipe |
| JP3823060B2 (en) * | 2002-03-04 | 2006-09-20 | 株式会社日立製作所 | High pressure fuel supply pump |
| EP1411236B1 (en) * | 2002-10-19 | 2012-10-10 | Robert Bosch Gmbh | Device for damping of pressure pulsations in a fluid system, especially in a fuel system of an internal combustion engine |
| JP2007113654A (en) * | 2005-10-19 | 2007-05-10 | Tokyo Institute Of Technology | Fine hollow structure diaphragm and its application element |
| JP2007138805A (en) * | 2005-11-17 | 2007-06-07 | Denso Corp | High pressure fuel pump |
| JP4650793B2 (en) * | 2006-05-16 | 2011-03-16 | 株式会社デンソー | Pulsation damper |
| DE102006027780A1 (en) * | 2006-06-16 | 2007-12-20 | Robert Bosch Gmbh | fuel injector |
| JP4686501B2 (en) * | 2007-05-21 | 2011-05-25 | 日立オートモティブシステムズ株式会社 | Liquid pulsation damper mechanism and high-pressure fuel supply pump having liquid pulsation damper mechanism |
| DE102008047303A1 (en) * | 2008-02-18 | 2009-08-20 | Continental Teves Ag & Co. Ohg | Pulsationsdämpfungskapsel |
| JP4678065B2 (en) * | 2009-02-25 | 2011-04-27 | 株式会社デンソー | Damper device, high-pressure pump using the same, and manufacturing method thereof |
| WO2010106645A1 (en) * | 2009-03-17 | 2010-09-23 | トヨタ自動車 株式会社 | Pulsation damper |
| JP2012184757A (en) * | 2011-03-08 | 2012-09-27 | Denso Corp | Damper device and high-pressure pump having the same |
| JP5644615B2 (en) * | 2011-03-22 | 2014-12-24 | 株式会社デンソー | Pulsation damper and high-pressure pump equipped with the same |
| DE102011113028B4 (en) * | 2011-09-10 | 2019-01-10 | Winkelmann Sp. Z.O.O. | Diaphragm expansion vessel |
| JP2013146389A (en) * | 2012-01-19 | 2013-08-01 | Panasonic Corp | Hand drying apparatus |
| JP5854005B2 (en) | 2013-07-12 | 2016-02-09 | 株式会社デンソー | Pulsation damper and high-pressure pump equipped with the same |
| JP6135437B2 (en) * | 2013-10-07 | 2017-05-31 | トヨタ自動車株式会社 | High pressure fuel pump |
| US10294907B2 (en) * | 2014-08-28 | 2019-05-21 | Hitachi Automotive Systems, Ltd. | High pressure fuel supply pump |
-
2014
- 2014-12-12 JP JP2014251675A patent/JP6527689B2/en active Active
-
2015
- 2015-11-24 WO PCT/JP2015/082936 patent/WO2016093054A1/en active Application Filing
- 2015-11-24 CN CN201580066432.5A patent/CN107002615B/en active Active
- 2015-11-24 US US15/533,209 patent/US10480466B2/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1135250A (en) * | 1994-09-14 | 1996-11-06 | 罗伯特·博施有限公司 | Fuel-injection system for two-stroke internal-combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2016113922A (en) | 2016-06-23 |
| US10480466B2 (en) | 2019-11-19 |
| WO2016093054A1 (en) | 2016-06-16 |
| US20170335810A1 (en) | 2017-11-23 |
| CN107002615A (en) | 2017-08-01 |
| JP6527689B2 (en) | 2019-06-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107002615B (en) | Diaphragm and pulsation damper using the same | |
| CN107614864B (en) | Pulsation damper | |
| US10605367B2 (en) | Sealing apparatus | |
| KR101926952B1 (en) | Diaphragm valve, fluid control device, semiconductor production device, and semiconductor production method | |
| JP2016113922A5 (en) | ||
| KR20180066079A (en) | A diaphragm cell for attenuating pressure pulsation in a low pressure region of the piston pump | |
| EP2744013A1 (en) | Cover body for battery case | |
| KR20160143832A (en) | Diaphragm valve, fluid control device, semiconductor production device, and semiconductor production method | |
| JP6691124B2 (en) | Diaphragm damper device, holding member thereof, and method for manufacturing diaphragm damper device | |
| US5449003A (en) | Undulated container for undulated diaphragm and diaphragm device | |
| CN109070866B (en) | Pressure pulsation reducing device and pulsation damping member for hydraulic system | |
| JP7237952B2 (en) | damper unit | |
| KR20200137010A (en) | Mounting structure of metal diaphragm damper | |
| JP2016035328A (en) | Membrane bellows | |
| CN107709820A (en) | Diaphragm Damper | |
| JPWO2018056109A1 (en) | Metal diaphragm damper | |
| CN111356833B (en) | Metal diaphragm damper and manufacturing method thereof | |
| JP5402004B2 (en) | Pulsation damper | |
| US11220987B2 (en) | Metal diaphragm damper | |
| US20190107167A1 (en) | Metal diaphragm damper | |
| US20240175533A1 (en) | Pulsation-damping member | |
| JP6975085B2 (en) | The outer shell member of the accumulator and its manufacturing method, and the accumulator and its manufacturing method. | |
| GB2599820A (en) | Fluid control device | |
| CN104246321B (en) | Static gasket with wire rod compression limiter |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |